ONTAP Data Processing latency - Resolution Guide
Applies to
ONTAP 9Description
- Troubleshoot Data Processing latency in ONTAP.
- CPU contention
- High CPU utilization
- Dblade latency
- WAFL latency
- In extreme circumstances, CPU starvation may result in service disruption
- Note: This is a secondary article on how to troubleshoot ONTAP 9 performance, please see the main ONTAP 9 performance troubleshooting Resolution Guide
- Using Active IQ Unified Manager or commands such as
qos statistics volume latency show
, latency is shown to be in the Data (CLI) or Data Processing (Active IQ Unified Manager), and latency is actively impacted on the target volume.
Example:
Cluster::> qos statistics volume latency show
Workload ID Latency Network Cluster Data Disk QoS NVRAM
--------------- ------ ---------- ---------- ---------- ---------- --------- --------- ---------
-total- - 136.49ms 99.00us 70.00us 136.17ms 153.00us 0ms 0ms
vserver1_vol1.. 4201 206.05ms 130.00us 0ms 205.88ms 44.00us 0ms 0ms
vserver5_vol8.. 7704 1309.00us 351.00us 1.00us 834.00us 114.00us 0ms 9.00us
-total- - 140.29ms 103.00us 75.00us 139.94ms 174.00us 0ms 0ms
vserver1_vol1.. 4201 379.03ms 127.00us 0ms 378.73ms 175.00us 0ms 0ms
vserver5_vol8.. 7704 2.02ms 309.00us 1.30us 1820.00us 105.00us 0ms 9.00us
Procedure
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Example: CPU is highest on cluster1::> qos statistics workload resource cpu show -node nodeB Workload ID CPU ------------------ ------ ----- -total- (100%) - 70% User-Default - 42% _SNAPMIRROR - 20% _Efficiency_BestEffort - 8% |
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cluster1::> qos statistics volume resource cpu show -node nodeB Workload ID CPU --------------- ------ ----- -total- (100%) - 71% vs0-wid101 101 22% file-1-wid121 121 11% vol0-wid1002 1002 8% |
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Additional Information
Information about Data Processing/CPU | |
Common Issues that cause Data Processing latency | |
Useful links/information |